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  6. Hot Melt Molding Case Study: "LED Module Waterproof Sealing"

Hot Melt Molding Case Study: "LED Module Waterproof Sealing"

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Low Pressure Molding, Hot Melt Molding, Waterproof and Dustproof Sealing Molding

last updated:Dec 12, 2025

Matsumoto kakou Co.,Ltd.
Matsumoto kakou Co.,Ltd.
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LED module waterproof sealing! A case of process improvement through switching from potting.

Hot melt molding is a molding technology that involves injecting a solvent-free, one-component thermoplastic hot melt adhesive into a mold under low pressure. This method is widely used for purposes such as dust-proofing, waterproofing, vibration resistance, impact resistance, insulation, and housing functionality. In this catalog, we introduce a case where the process was improved by switching from potting to hot melt molding for waterproof sealing of LED modules. 【Conventional Method: Silicone Potting】 - A bathtub for polycarbonate molded products is created. - The module is placed in the case and secured. - Silicone resin is poured in and cured by heating for 80 minutes. ↓ 【Hot Melt Molding Method】 - Two modules are set on the mold. - Pressing the molding start button completes the sealing in 40 seconds. *For more details, please refer to the catalog or feel free to contact us.

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Hot Melt Molding Case Study: "LED Module Waterproof Sealing"

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Hot Melt Molding Case Study: "LED Module Waterproof Sealing"

Hot Melt Molding Case Study: "LED Module Waterproof Sealing"

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"Complete sealing of electronic components in just a few dozen seconds. Waterproof, dustproof, and insulated." Case studies on hot melt molding. ■Matsumoto Processing■

"Complete sealing of electronic components in just a few dozen seconds. Waterproof, dustproof, and insulated." Case studies on hot melt molding. ■Matsumoto Processing■

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"Complete sealing of electrical components in just a few dozen seconds. Waterproof, dustproof, and insulated." Case studies on hot melt molding (automotive parts) ■Matsumoto Processing■

"Complete sealing of electrical components in just a few dozen seconds. Waterproof, dustproof, and insulated." Case studies on hot melt molding (automotive parts) ■Matsumoto Processing■

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Hot Melt Molding Product Case Studies (Photos Before*After)

Hot Melt Molding Product Case Studies (Photos Before*After)

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Hot melt molding for waterproofing, dustproofing, and miniaturization of M2M/IOT sensors.

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Our company specializes in hot melt technology, specifically "hot melt molding," which is used for low-pressure molding to seal electronic devices. In recent years, we have received a significant number of inquiries for M2M/IOT applications, particularly for sensors installed outdoors and those used in harsh environments, aimed at waterproofing, dustproofing, and insulation. Examples of inquiries: - Sensors for agricultural applications (soil sensors, livestock management sensors) - Sensors for building management - Sensors for monitoring the operational status of outdoor equipment (such as outdoor units) - Drones, etc. Why is hot melt molding gaining attention? - It can mold at low pressure, allowing for sealing even delicate sensors. - Extensive waterproofing and dustproofing experience cultivated through automotive components. - The hot melt used is flame-retardant and UL94 V-0 certified. - The raw materials are derived from natural components (non-petroleum-based) and are environmentally friendly. Matsumoto Processing also accommodates small-batch sealing through a contract production system. Customers with themes related to waterproofing and dustproofing for sensors are encouraged to inquire.

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Hot Melt Molding for Waterproofing and Dustproofing, as well as Miniaturization of M2M/IOT Sensors

  • Product news

Our company specializes in hot melt technology, specifically "hot melt molding," which is used for low-pressure molding to seal electronic devices. In recent years, we have received numerous inquiries for M2M/IOT applications, particularly for sensors installed outdoors and those used in harsh environments, aimed at waterproofing, dustproofing, and insulation. Examples of inquiries: - Sensors for agricultural applications (soil sensors, livestock management sensors) - Sensors for building management - Sensors for monitoring the operational status of outdoor equipment (such as outdoor units) - Drones, etc. Why is hot melt molding gaining attention? - It can mold at low pressure, allowing for sealing of delicate sensors. - Extensive waterproof and dustproof track record developed through automotive components. - The hot melt used is flame-retardant and UL94 V-0 certified. - Raw materials are derived from natural components (non-petroleum-based) and are environmentally friendly. Matsumoto Processing also accommodates small-volume sealing through a contract production system. Customers with themes related to waterproofing and dustproofing for sensors are encouraged to inquire.

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Matsumoto kakou Co.,Ltd.

Manufacturing and processing contract

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Our company provides comprehensive support for the introduction of hot melt molding methods, from initial technical discussions and appropriate hot melt selection to prototype production and evaluation, optimal process considerations for mass production, proposals for optimal equipment or the design and manufacturing of dedicated machines (automated systems), hot melt supply and line support. For customers for whom equipment installation poses a barrier to adopting this method, we even offer production contracting at our facility, ensuring support from "start to finish." **Benefits of Hot Melt Molding** - Improved production efficiency and cost reduction through alternative methods to potting - Greater design flexibility due to mold forming, enabling miniaturization and lightweighting of components - Use of sustainable raw materials derived from natural fatty acids We have various molding machines and displays of adopted products available at our prototype lab in Fuji City, Shizuoka Prefecture. Please feel free to visit, even just for a tour.

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